In zazen do we think? Do we not think? This can be confusing?
It’s not that we have to shut out thoughts, but rather we don’t have to become so involved with them. They bubble up. Thoughts bubble up on their own. In practice, we have a choice of whether to engage with our thoughts; whether to believe them. Whether to become involved with and follow them. Or whether instead, just to recognize their evanescent nature, see them arising unbidden, and then watch them dissolve.
This enables us to recognize that our mind is much more than our thoughts and to discover the open field of awareness into which thoughts bubble.